ARM: omapl138_lcdk: Enable SPL_DM_SEQ_ALIAS and SPL_OF_TRANSLATE

In order to further prepare for full device tree support in SPL,
this patch enables both SPL_DM_SEQ_ALIAS and SPL_OF_TRANSLATE.
Both of these are already enabled in U-Boot, so SPL will have
the same functionality

Signed-off-by: Adam Ford <aford173@gmail.com>
Tested-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>